Row sums of correlation triangle for (1+x)^3/(1-x).

Terms

a(0) =1a(1) =8a(2) =31a(3) =80a(4) =160a(5) =272a(6) =416a(7) =592a(8) =800a(9) =1040a(10) =1312a(11) =1616a(12) =1952a(13) =2320a(14) =2720a(15) =3152a(16) =3616a(17) =4112a(18) =4640a(19) =5200a(20) =5792a(21) =6416a(22) =7072a(23) =7760a(24) =8480a(25) =9232a(26) =10016a(27) =10832a(28) =11680a(29) =12560